<template>
  <div class="todo-footer" v-show="total">
    <label for="">
      <!-- <input type="checkbox" :checked="isAll" @change="checkAll" /> -->
      <input type="checkbox" v-model="isAll" />
    </label>
    <span>
      <span>已完成{{doneTotal}}</span>/全部{{todos.length}}
    </span>
    <button class="btn btn-danger" @click="clearAll">清除已完成任务</button>
  </div>
</template>
<script>
export default {
  name: 'MyFooter',
  props: ['todos'],
  computed: {
    total() {
      return this.todos.length;
    },
    doneTotal() {
      /*const x=this.todos.reduce((pre,current)=>{
        console.log('@',pre,current);
        return pre +(current.done?1:0)
      },0)*/
      return this.todos.reduce((pre, todo) => pre + (todo.done ? 1 : 0), 0);
    },
    isAll: {
      get() {
        return this.doneTotal === this.total && this.total > 0;
      },
      set(value) {
        this.$emit('checkAllTodo', value);
      }
    }
  },
  methods: {
    // checkAll(e) {
    //   this.checkAllTodo(e.target.checked);
    // }
    clearAll() {
      this.$emit('clearAllTodo');
    }
  }
};
</script>
<style lang="less" rel="stylesheet/less" scoped>
/*footer*/
.todo-footer {
  height: 40px;
  line-height: 40px;
  padding-left: 6px;
  margin-top: 5px;
}
.todo-footer label {
  display: inline-block;
  margin-right: 20px;
  cursor: pointer;
}
.todo-footer label input {
  position: relative;
  top: -1px;
  vertical-align: middle;
  margin-right: 5px;
}
.todo-footer button {
  float: right;
  margin-top: 5px;
}
</style>